Strophotron spontaneous emission in a Free-Electron Laser with transversally inhomogeneous magnetic field

摘要

A relativistic electron motion in a transversally inhomogeneous magnetic field of a wiggler is shown to consist of fast (undulator) and slow (strophotron) components. By separating fast and slow motions and by averaging equations of motion over fast undulator oscillations, we find spectral intensity of strophotron spontaneous emission in such a system. The strophotron intensity of spontaneous emission is shown to be well separated spectrally from the usual undulator parts.